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Polarized neutron interferometry - A historical view

Quantum for ever. Polarized neutron interferometry - A historical view. A symposium to honor Helmut Rauch‘s 80 th birthday and the Designation of the Atominstitut as an EPS Historic Site. Gerald Badurek. Forever young !. 1975 Physicist excursion to CERN, ILL, ….

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Polarized neutron interferometry - A historical view

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  1. Quantum forever Polarizedneutroninterferometry - A historicalview A symposiumtohonor Helmut Rauch‘s 80thbirthday and the Designation of the Atominstitut as an EPS Historic Site Gerald Badurek

  2. Foreveryoung! 1975 Physicistexcursionto CERN, ILL, … G. Badurek, Symposium „Quantum forever“

  3. Anotherhistoricmoment Howitbegan…? Student demonstration Prague Nov. 16, 1989 G. Badurek, Symposium „Quantum forever“

  4. Anotherhistoricmoment „Neutron interferometry – – The Schrödinger equation at work“ 'Schrödinger Symposium', CSSR Academy of Sciences Villa Lana, Prague, Nov. 16, 1989 G. Badurek, Symposium „Quantum forever“

  5. Howitcontinued…? The cryforfreedom! Wenceslas Square, Prague, Nov. 17, 1989 G. Badurek, Symposium „Quantum forever“

  6. Polarizedneutroninterferometry - Howitbegan…? G. Badurek, Symposium „Quantum forever“

  7. Unpolarizedincident beam – creation of polarizationbynuclearphase shift & magneticspinrotation G. Badurek, Symposium „Quantum forever“

  8. Unpolarizedincident beam – creation of polarizationbynuclearphase shift & magneticspinrotation a = (-g/u)òB ds Dc = -NlbcDD Unpolarizedincident beam Polarizedincident beam G. Badurek, Symposium „Quantum forever“

  9. ¯ ­ ¯ s eigenstate s of , K z z z Polarizedneutroninterferometry - Howitcontinued…? Stern-Gerlach Gedankenexperiment with electrons E.P. Wigner, „The problem of measurement“, Journal of Physics 31 (1963) 6-15 Spinor: Two spin states: Coherent superposition: COHERENT SUPERPOSITION CLASSICAL MIXTURE G. Badurek, Symposium „Quantum forever“

  10. A non-conventionalpolarizerconcept G. Badurek, Symposium „Quantum forever“

  11. Magneticfield-prismrefraction G. Badurek, Symposium „Quantum forever“

  12. Afirstfeasibilitytest B =1.5 T f =90° d =1.5 mm l =2.94 Å G. Badurek, Symposium „Quantum forever“

  13. The firstusefulprototype fieldprism(1982) Water-cooledelectromagneticyoke B@ 0.8 T f =120° d = 4.5 mm • Disadvantages: • Rather lowgapwidth • High power consumption(»600 W) • Watercoolingrequired • Large spacerequirements G. Badurek, Symposium „Quantum forever“

  14. G. Badurek, R. Buchelt, G. Kroupa, M. Baron, M. Villa Physica B 283 (2000) 186 An importantstepforward(1998) NdFeB-based permanentmagnetyoke (VAC Hanau) B= 0.95 T, f= 116°, d = 10 mm G. Badurek, Symposium „Quantum forever“

  15. Anythingelse? G. Badurek, Symposium „Quantum forever“

  16. Change of total n-energy Resonantneutron – photoninteraction Frequency: Amplitude: Energy transfer: NMR-like arrangement G. Badurek, Symposium „Quantum forever“

  17. Off resonance Resonance Magneticresonanceenergysplitting Measured with a high-resolution neutron “backscattering” spectrometer 0.276 meV B0 = 1.964 T,nres= 57.289 MHz 0.482 ± 0.015 meV G. Badurek, Symposium „Quantum forever“

  18. Spin statesuperposition G. Badurek, Symposium „Quantum forever“

  19. Spin statesuperposition G. Badurek, Symposium „Quantum forever“

  20. Spin statesuperposition – experimental setup G. Badurek, Symposium „Quantum forever“

  21. Staticspinstatesuperposition Polarisation analysis in x-direction Polarisation analysis in z-direction G. Badurek, Symposium „Quantum forever“

  22. Staticspinstatesuperposition Polarisation analysis in x-direction Polarisation analysis in z-direction G. Badurek, Symposium „Quantum forever“

  23. Time-dependentspinstatesuperposition G. Badurek, Symposium „Quantum forever“

  24. Time-dependentspinstatesuperposition Stroboscopic detection scheme ! Polarisation analysis in x-direction Polarisation analysis in z-direction G. Badurek, Symposium „Quantum forever“

  25. Time-dependentspinstatesuperposition Stroboscopic detection scheme ! Polarisation analysis in x-direction Polarisation analysis in z-direction Particle-Phase “Uncertainty Relation” N. Imoto et al. Phys. Rev. A 32 (1985) 2287 G. Badurek, Symposium „Quantum forever“

  26. Nice commentaryof A.G. Wagh (1999)* Neutron interferometry was the first to correlate complementarity and `which-way' information *A.G. Wagh, Phys. Lett. A 259 (1999) 81 Abstract A neutron interference experiment [Phys. Lett. A 90 (1982) 110] conclusively established the correlation between Complementarity and `which-way' information. A recent rediscovery of this correlation in an analogous atom interference experiment [Nature 395 (1998) 33] has now been hailed [Nature 395 (1998) 12] as a major epistemological breakthrough. Which-way entangles Complementarity Most certainly not with Uncertainty Resonate microwaved atoms emphatically Déjà vu, may we interfere neutronically? G. Badurek, Symposium „Quantum forever“

  27. Macroscopicquantumbeating G. Badurek, Symposium „Quantum forever“

  28. Interferometricdouble resonanceexperiment (w1≠w2) Macroscopicquantumbeating Beating period: G. Badurek, Symposium „Quantum forever“

  29. Thankyouverymuch, Helmut, for such a longexciting and challengingperiod of myscientificlife! 1976 2000 G. Badurek, Symposium „Quantum forever“

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